public void CopyAttributes(SgmlNode node)
{
Precondition.Require(node, () => Error.ArgumentNull("node"));
int index = 0;
int count = node._attributes.Count;
while (index < count)
{
Attribute attribute = node._attributes[index];
AddAttribute(attribute.Name, attribute.Value,
attribute.QuoteChar, false).DtdType = attribute.DtdType;
index++;
}
}
/// <summary>
/// Reads the next node from the stream.
/// </summary>
/// <returns>true if the next node was read successfully;
/// false if there are no more nodes to read.</returns>
public override bool Read()
{
if (_current == null)
OpenInput();
if (_node.Simulated)
{
_node.Simulated = false;
_node = Top();
_state = _node.State;
return true;
}
bool foundNode = false;
while (!foundNode)
{
switch (_state)
{
case State.Initial:
_state = State.Markup;
_current.ReadChar();
goto case State.Markup;
case State.Eof:
if (_current.Parent != null)
{
_current.Close();
_current = _current.Parent;
}
else
return false;
break;
case State.EndTag:
if (String.Equals(_endTag, _node.Name,
StringComparison.InvariantCultureIgnoreCase))
{
Pop();
_state = State.Markup;
goto case State.Markup;
}
Pop();
foundNode = true;
break;
case State.Markup:
if (_node.IsEmpty)
Pop();
foundNode = ParseMarkup();
break;
case State.PartialTag:
Pop();
_state = State.Markup;
foundNode = ParseTag(_partial);
break;
case State.PseudoStartTag:
foundNode = ParseStartTag('<');
break;
case State.AutoClose:
Pop();
if (_stack.Count <= _popToDepth)
{
_state = State.Markup;
if (_newNode != null)
{
Push(_newNode);
_newNode = null;
_state = State.Markup;
}
else if (_node.NodeType == XmlNodeType.Document)
{
_state = State.Eof;
goto case State.Eof;
}
}
foundNode = true;
break;
case State.CData:
foundNode = ParseCData();
break;
case State.Attr:
goto case State.AttrValue;
case State.AttrValue:
_state = State.Markup;
goto case State.Markup;
case State.Text:
Pop();
goto case State.Markup;
case State.PartialText:
if (ParseText(_current.LastChar, false))
_node.NodeType = XmlNodeType.Whitespace;
foundNode = true;
break;
}
if (foundNode && _node.NodeType == XmlNodeType.Whitespace &&
_whitespaceHandling == WhitespaceHandling.None)
foundNode = false;
if (!foundNode && _state == State.Eof && _stack.Count > 1)
{
_popToDepth = 1;
_state = State.AutoClose;
_node = Top();
return true;
}
}
if (!_foundRoot && (NodeType == XmlNodeType.Element ||
NodeType == XmlNodeType.Text ||
NodeType == XmlNodeType.CDATA))
{
_foundRoot = true;
if (IsHtml && (NodeType != XmlNodeType.Element ||
!String.Equals(LocalName, "html",
StringComparison.InvariantCultureIgnoreCase)))
{
_node.State = _state;
SgmlNode root = Push("html", XmlNodeType.Element, null);
SwapTopNodes();
_node = root;
root.Simulated = true;
root.IsEmpty = false;
_state = State.Markup;
}
return true;
}
return true;
}
private static void ValidateAttribute(SgmlNode node, Attribute a)
{
ElementDeclaration e = node.DtdType;
if (e != null)
{
AttributeDefinition ad = e.FindAttribute(a.Name);
if (ad != null)
a.DtdType = ad;
}
}
private void ValidateContent(SgmlNode node)
{
if (node.NodeType == XmlNodeType.Element)
{
if (!VerifyName(node.Name))
{
Pop();
Push(null, XmlNodeType.Text, "<" + node.Name + ">");
return;
}
}
if (_dtd != null)
{
string name = node.Name.ToUpper(CultureInfo.InvariantCulture);
int i = 0;
int top = _stack.Count - 2;
if (node.DtdType != null)
{
for (i = top; i > 0; i--)
{
SgmlNode n = _stack[i];
if (n.IsEmpty)
continue;
ElementDeclaration f = n.DtdType;
if (f != null)
{
if (i == 2 && String.Equals(f.Name, "BODY",
StringComparison.InvariantCultureIgnoreCase))
break;
else if (String.Equals(f.Name, _dtd.Name,
StringComparison.InvariantCultureIgnoreCase))
break;
else if (f.CanContain(name, _dtd))
break;
else if (!f.EndTagOptional)
break;
}
else
break;
}
}
if (i == 0)
{
return;
}
else if (i < top)
{
SgmlNode n = _stack[top];
if (i == top - 1 && String.Equals(name, n.Name,
StringComparison.InvariantCultureIgnoreCase))
{
// e.g. p not allowed inside p, not an interesting error.
}
else
{
#if DEBUG
string closing = "";
for (int k = top; k >= i+1; k--)
{
if (closing != "")
closing += ",";
SgmlNode n2 = _stack[k];
closing += "<" + n2.Name + ">";
}
Log("Element '{0}' not allowed inside '{1}', closing {2}.", name, n.Name, closing);
#endif
}
_state = State.AutoClose;
_newNode = node;
Pop();
_popToDepth = i + 1;
}
}
}
private void Validate(SgmlNode node)
{
if (_dtd != null)
{
ElementDeclaration e = _dtd.FindElement(node.Name);
if (e != null)
{
node.DtdType = e;
if (e.ContentModel.DeclaredContent == DeclaredContent.Empty)
node.IsEmpty = true;
}
}
}
private bool ParseEndTag()
{
_state = State.EndTag;
_current.ReadChar();
string name = ScanName(_tagTerm);
char ch = _current.SkipWhitespace();
if (ch != '>')
{
Log("Expected empty start tag '/>' sequence instead of '{0}'", ch);
_current.ScanToEnd(_builder, "Recovering", ">");
}
_current.ReadChar();
_endTag = name;
bool caseInsensitive = (_folding == CaseFolding.None);
_node = _stack[_stack.Count - 1];
for (int i = _stack.Count - 1; i > 0; i--)
{
SgmlNode n = _stack[i];
if (String.Compare(n.Name, name, caseInsensitive,
CultureInfo.InvariantCulture) == 0)
{
_endTag = n.Name;
return true;
}
}
Log("No matching start tag for '</{0}>'", name);
_state = State.Markup;
return false;
}
private void Pop()
{
if (_stack.Count > 1)
_node = _stack.Pop();
}
private SgmlNode Push(SgmlNode n)
{
SgmlNode n2 = Push(n.Name, n.NodeType, n.Value);
n2.DtdType = n.DtdType;
n2.IsEmpty = n.IsEmpty;
n2.Space = n.Space;
n2.XmlLang = n.XmlLang;
n2.State = n.State;
n2.CopyAttributes(n);
_node = n2;
return n2;
}
private SgmlNode Push(string name, XmlNodeType nodeType, string value)
{
SgmlNode result = _stack.Push();
if (result == null)
{
result = new SgmlNode();
_stack[_stack.Count - 1] = result;
}
result.Reset(name, nodeType, value);
_node = result;
return result;
}
protected virtual void Init()
{
_state = State.Initial;
_stack = new HWStack<SgmlNode>(10);
_node = Push(null, XmlNodeType.Document, null);
_node.IsEmpty = false;
_builder = new StringBuilder();
_nameBuilder = new StringBuilder();
_popToDepth = 0;
_current = null;
_partial = '\0';
_endTag = null;
_attr = null;
_attrPosition = 0;
_newNode = null;
_rootCount = 0;
_foundRoot = false;
_unknownNamespaces.Clear();
}
public void CopyAttributes(SgmlNode node)
{
Precondition.Require(node, () => Error.ArgumentNull("node"));
int index = 0;
int count = node._attributes.Count;
while (index < count)
{
Attribute attribute = node._attributes[index];
AddAttribute(attribute.Name, attribute.Value,
attribute.QuoteChar, false).DtdType = attribute.DtdType;
index++;
}
}